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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        * {
            margin: 0;
            padding: 0;
        }
        
        div {
            text-align: center;
        }
        
        table {
            margin: 0 auto
        }
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<body>
    <div id="app">
        <h4>欢迎光临_vue开发的收银系统_水果店</h4>
        <table :border="1" width="600" height="100">
            <caption>
                苹果10￥/斤，折扣/《8折》
            </caption>
            <tbody>
                <tr>
                    <td>
                        <span>请输入你要购买的斤数</span>
                        <input type="number" placeholder="请输入斤数" v-model.number="goodCatty" />
                    </td>
                </tr>
                <tr>
                    <td>
                        <button @click="payMoney">结账买单</button>
                    </td>
                </tr>
            </tbody>
        </table>
        <p>结账单：总价:{{totalPrice}}元 折后价:{{totalPrice * 0.8}}元 省了:{{totalPrice * 0.2}}元</p>
    </div>
    <script src="../vue.js"></script>
    <script>
        new Vue({
            el: '#app',
            data: {
                goodCatty: 0,
                totalPrice: 0
            },
            methods: {
                payMoney() {
                    this.totalPrice = parseInt(this.goodCatty.toFixed(2) * 100) / 10
                }
            }
        })
    </script>
</body>

</html>